That is strange, I have them on my BP6 without any problems. If you say they don't fit, I believe you though. If I were in that situation, I guess I'd either return them and try some of the FOP-series, or maybe jack them up with a copper shim from
millisec, but that is going to decrease the thermal performance a bit.
Filing a recess into the bottom of the sink to make room for the lever is probably the best way to fix it without spending any more money. Sorry if I've misguided you, hope this is some help...